Use 'About Grants' tab to explore Types of Grants Programs
Use 'Funding' tab to search NIH Guide for Grants and Contracts
Foundation Directory Online is a database of the 10,000 largest private and community foundations in the U.S. based on their annual giving.
A searchable database of grant funding opportunities, formerly IRIS (Illinois Research Information Service).
SPIN provides robust searchable database to track funding programs (grants, fellowships, publication subventions, etc.) of government, private and nonprofile funding globally.
A searchable database for finding U.S. federal grants and an interface used for submitting proposals. You can search for grants, sign up for email notifications, and apply for grants through this portal.